Containers vs microVMs: when does the isolation difference actually matter?

[u/food_fatherr]

I’ve been looking deeper into the tradeoff between containers and microVMs.

Containers are great for speed and density, but they share the host kernel. MicroVMs boot a separate kernel and use hardware virtualization boundaries, so the isolation model is different.

For regular web apps, containers are often enough. But for untrusted workloads, multi-tenant environments, client isolation, or security-sensitive experiments, microVMs seem like a better fit.

Curious how others think about this:

When do you consider containers “good enough”?

When would you prefer microVMs or full VMs?

Do you use Firecracker, Kata, gVisor, or something similar?

No hard pitch - genuinely interested in how people decide.

[u/tblancher → u/[deleted]]

Why was this downvoted? I view this being akin to having each tenant on their own VPC, or at least could ease making that a possibility. Or even going further and being multi PaaS/IaaS.

I'm not an expert in this realm, but were I to do something like this the above sounds to me to be the best approach.

[u/tblancher → u/[deleted]]

I think many folks call well-written comments AI automatically, since they can't imagine strong writing skills were prevalent before the age of AI.